PH-478

Refraction

Physics · Secondary 3 · Medium · Refraction

In an optical fibre, light travels at a speed of

2.0 \times 10^8\,\text{m s}^{-1}

. The speed of light in air is

3.0 \times 10^8\,\text{m s}^{-1}

. What is the refractive index of the glass in the fibre?

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